.main{
    position: absolute;
    top:10px;
    left:340px;
    background: rgba(0, 0, 0, .5);
    color: #fff;
    padding: 10px;
    overflow: hidden;
    overflow-y: auto;
    box-sizing: border-box;
    text-align: left;
}
.main > h1{
    font-size: 24px;
}
.projectlist{
    margin-top: 20px;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
}
.projectBox{
    width:300px;
    margin: 20px;
    line-height: 1.7;
}
.projectBox img{
    width: 100%;
    height: 137.25px;
 }
.projectBox h3{
    font-size: 18px;
}
.nav{
    float: right;
    font-size: 18px;
}
@media screen and (max-width: 720px)  {
    .main{
        left: 0;
    }
    .projectBox{
        width: 98%;
        margin: 10px auto;
    }
}